7.5×45+65×2.5的简便运算
7.5×45+65×2.5的简便运算
7.5×45+65×2.5的简便运算
=2.5x（3x45+65）
=2.5x200
=500
7.5×45+17×2.5简便运算
=2.5*3*45+17*2.5
=2.5*135+17*2.5
=2.5*(135+17)
=2.5*152
=2.5*4*38
=10*38
=380
7.5*8.3+2.5*9,简便运算
7.5*8.3+2.5*9.1
=2.5*24.9+2.5*9.1
=2.5*(24.9+9.1)
=2.5*34
=85
7.5*27+19*2.5的简便运算
7.5×27+19×2.5
=2.5×3×27+19×2.5
=2.5×81+19×2.5
=2.5×（81+19）
=2.5×100
=250
0.85×7.5+8.5×2.5的简便运算
0.85×7.5+8.5×2.5=0.85×7.5+0.85×25=0.85×（7.5+25）=0.85×32.5=27.625
365*45-45*65简便运算
365*45-45*65简便运算
365*45-45*65
=45*(365-65)
=45*300
=13500
7.5×9+2.5×9-55的简便运算
7.5×9+2.5×9-55
=（7.5+2.5）×9-55
=10×9-55
=90-55
=35
99*45+33*65的简便运算
99*45+33*65
=33*(3*45)+33*65
=33*135+33*65
=33*(135+65)
=33*200
=6600
56*45+54*65的简便运算
56*45+54*65
=（55+1）*45+（55-1）*65
=55*(45+65)+45-65
=55*110-20
=55*(100+10)-20
=5500+550-20
=6030
3.69×45 36.9 2.5 0.369 ×300 简便运算
3.69×45 + 36.9 x 2.5 + 0.369 ×300
= 36.9 x 4.5 + 36.9 x 2.5 + 36.9 x 3
= 36.9 x (4.5 + 2.5 + 3)
= 36.9 x 10
= 369
